Engine
Engine Misfire — Causes and Diagnosis for Cars and Vans
An engine misfire causes juddering, rough running, and increased emissions, often due to ignition, fuel, or compression issues.
A misfire occurs when one or more cylinders fail to combust properly. Symptoms include a noticeable shudder through the vehicle, loss of power, poor fuel economy, and a flashing check engine light. In petrol vans, common causes are faulty spark plugs, ignition coils, or fuel injectors. In diesel vans, injector failure, low compression, or EGR problems are more likely. A misfire that is left untreated can damage the catalytic converter and oxygen sensors due to unburned fuel entering the exhaust system.
Key takeaways
- Petrol vans — check spark plugs, coils, and injectors first
- Diesel vans — injector and compression issues are the most likely cause
- A flashing check engine light means the misfire is severe and needs urgent attention
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